A few general things I see.
- Powers
-- You probably don't need all 3 holds between Dark and Ice. Personally I would drop Bitter Freeze Ray as it's the slowest of the 3.
-- You skip Ice Blast, which is not a good idea as it is very good in a ST attack chain. I would pick it up instead of Bitter Freeze Ray.
-- Aim isn't mandatory, but Aim+Tar Patch+ Ice Storm/Blizzard is fun.
-Slotting
-- Twilight Grasp needs to hit in order to heal and Doctored Wounds doesn't have any ACC in it. Take a look at the Accurate Heal sets though (sadly I don't think they have any +Recharge set bonuses that I bet you are gunning for here).
-- Darkest Night is overslotted. If you want Dark Watcher's, get the 3 IOs with End Redux (it's a hog) plus one of the others to suit your tastes to get back a slot and keep the recharge bonus.
-- Shadow Fall is better served slotted for Resistance as Dark brings ample -ToHit with it. Layered defenses are better than focusing on one. Shadow Fall + Dark Embrace will net decent resists.
-- The proc in Fearsome Stare will let a spawn get an attack off on you before they go into cowering. You may or may not want that.
-- Freeze Ray does pathetic damage, slot it as a hold instead.
-- Petrifying Gaze will needs more slots to be effective.
-- Ice Storm should be slotted as an AoE attack.
-- Tough is WAY overslotted for what it does, especially considering you have Shadow Fall+Dark Embrace.
-- There's a few hundred different ways to slot Fluffy, but I tend to lean towards more -ToHit as he runs Chill of the Night, which is a PBAoE auto-hit power (think the CoT ghost leuts).
-- Dark Consumption is overslotted for End Mod.
-- Dark Embrace could use more slots.
It really looks like you went the route of deciding on set bonuses and only looking at that, in this case defense and recharge. Your powers REALLY suffer in some cases how they are slotted. A few suggestions on that note.
-- Don't worry so much about defense with Dark/Ice. The -ToHit, resists from Shadow Fall+Dark Embrace, the -Dmg from Darkest Night, Fear from Fearsome stare, at least 2 holds and one of the best heals in the game is WAY more than you need to worry about a few measly defense set bonuses.
-- Dark/Ice is nice in that, if you want, you can play it form almost entirely ranged. To that end if you want to work in some defense form sets, stick to ranged bonuses.
-- As for recharge, there a few things you could do that will help offset better slotting on other powers. 4/6 Basilisks Gaze will get you 7.5% Recharge in Hold Powers. 5/6 Decimation will get you 6.25% in ST Ranged powers (and a fun Build Up Proc if you want). 4/6 Clouded Senses in Fearsome Stare is another 6.25% (and I tend to prefer enhancing the -ToHit instead of the Fear duration myself).
And here is a quickly made starting point to go with the above.
Hero Plan by Mids' Hero Designer 1.92
http://www.cohplanner.com/
Click this DataLink to open the build!
Test: Level 50 Technology Defender
Primary Power Set: Dark Miasma
Secondary Power Set: Ice Blast
Power Pool: Speed
Power Pool: Fighting
Power Pool: Leaping
Ancillary Pool: Dark Mastery
Hero Profile:
Level 1: Twilight Grasp -- Theft-Heal(A), Theft-Heal/Rchg(3), Theft-Acc/Heal(3), Theft-Acc/EndRdx/Heal(5), Theft-Acc/EndRdx/Rchg(5)
Level 1: Ice Bolt -- Dev'n-Acc/Dmg(A), Dev'n-Dmg/EndRdx(7), Dev'n-Dmg/Rchg(7), Dev'n-Acc/Dmg/EndRdx/Rchg(9)
Level 2: Ice Blast -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(11), Thundr-Dmg/Rchg(11), Thundr-Acc/Dmg/Rchg(13), Thundr-Acc/Dmg/EndRdx(13), Thundr-Dmg/EndRdx/Rchg(46)
Level 4: Tar Patch -- RechRdx-I(A), RechRdx-I(9)
Level 6: Frost Breath -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(15), Posi-Dmg/Rchg(17), Posi-Dmg/Rng(17), Posi-Acc/Dmg/EndRdx(19)
Level 8: Darkest Night -- DarkWD-ToHitdeb/Rchg/EndRdx(A), DarkWD-Rchg/EndRdx(19), DarkWD-ToHitDeb/EndRdx(21), DarkWD-ToHitDeb/Rchg(21)
Level 10: Howling Twilight -- RzDz-EndRdx/Stun(A), RzDz-Acc/EndRdx(15), RzDz-Stun/Rng(23), RzDz-Acc/Stun/Rchg(23), RzDz-Immob%(25)
Level 12: Fearsome Stare -- Cloud-Acc/ToHitDeb(A), Cloud-Acc/Rchg(27), Cloud-ToHitDeb/EndRdx/Rchg(27), Cloud-Acc/EndRdx/Rchg(29)
Level 14: Hasten -- RechRdx-I(A), RechRdx-I(29), RechRdx-I(37)
Level 16: Freeze Ray -- BasGaze-Acc/Rchg(A), BasGaze-Rchg/Hold(31), BasGaze-EndRdx/Rchg/Hold(31), BasGaze-Acc/EndRdx/Rchg/Hold(33)
Level 18: Super Speed -- Run-I(A)
Level 20: Ice Storm -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(33), Posi-Dmg/Rchg(33), Posi-Acc/Dmg/EndRdx(34), Posi-Dam%(34)
Level 22: Petrifying Gaze -- BasGaze-Acc/Rchg(A), BasGaze-Rchg/Hold(34), BasGaze-EndRdx/Rchg/Hold(36), BasGaze-Acc/EndRdx/Rchg/Hold(36)
Level 24: Shadow Fall -- LkGmblr-Rchg+(A), TtmC'tng-ResDam(25), TtmC'tng-ResDam/EndRdx(31), TtmC'tng-ResDam/EndRdx/Rchg(36)
Level 26: Boxing -- Acc-I(A)
Level 28: Bitter Ice Blast -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(37), Thundr-Dmg/Rchg(39), Thundr-Acc/Dmg/Rchg(39), Thundr-Acc/Dmg/EndRdx(39), Thundr-Dmg/EndRdx/Rchg(46)
Level 30: Tough -- S'fstPrt-ResDam/Def+(A)
Level 32: Dark Servant -- DampS-ToHitDeb/Rchg(A), DampS-ToHitDeb/Rchg/EndRdx(37), DampS-Rchg/EndRdx(40), DampS-ToHitDeb/EndRdx(40), DampS-ToHitDeb(40)
Level 35: Weave -- LkGmblr-Rchg+(A), LkGmblr-Def(42), LkGmblr-Def/EndRdx(42), LkGmblr-Def/EndRdx/Rchg(42)
Level 38: Blizzard -- Posi-Acc/Dmg(A), Posi-Dmg/EndRdx(43), Posi-Dmg/Rchg(43), Posi-Acc/Dmg/EndRdx(43), Posi-Dam%(45)
Level 41: Combat Jumping -- Ksmt-ToHit+(A)
Level 44: Dark Consumption -- Efficacy-EndMod/Rchg(A), Efficacy-EndMod/Acc/Rchg(45), Efficacy-Acc/Rchg(45), Efficacy-EndMod/Acc(46)
Level 47: Dark Embrace -- ImpArm-ResDam(A), ImpArm-ResDam/EndRdx(48), ImpArm-ResDam/Rchg(48), ImpArm-ResDam/EndRdx/Rchg(48)
Level 49: Soul Drain -- Erad-Acc/Rchg(A), Erad-Dmg/Rchg(50), Erad-Acc/Dmg/Rchg(50), Erad-Acc/Dmg/EndRdx/Rchg(50)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 1: Vigilance
Level 2: Rest -- Empty(A)
Level 4: Ninja Run
Level 2: Swift -- Empty(A)
Level 2: Health -- Empty(A)
Level 2: Hurdle -- Empty(A)
Level 2: Stamina -- Empty(A)
------------
Set Bonus Totals:
- 8% DamageBuff(Smashing)
- 8% DamageBuff(Lethal)
- 8% DamageBuff(Fire)
- 8% DamageBuff(Cold)
- 8% DamageBuff(Energy)
- 8% DamageBuff(Negative)
- 8% DamageBuff(Toxic)
- 8% DamageBuff(Psionic)
- 4.25% Defense(Smashing)
- 4.25% Defense(Lethal)
- 3% Defense(Fire)
- 3% Defense(Cold)
- 18.63% Defense(Energy)
- 18.63% Defense(Negative)
- 4.875% Defense(Psionic)
- 5.5% Defense(Melee)
- 14.56% Defense(Ranged)
- 3% Defense(AoE)
- 9.9% Max End
- 65% Enhancement(RechargeTime)
- 2% Enhancement(Stun)
- 5% Enhancement(Heal)
- 50% Enhancement(Accuracy)
- 8% FlySpeed
- 114.45 HP (11.25%) HitPoints
- 8% JumpHeight
- 8% JumpSpeed
- MezResist(Confused) 2.5%
- MezResist(Held) 2.5%
- MezResist(Immobilize) 2.5%
- MezResist(Sleep) 4.7%
- MezResist(Stun) 2.5%
- MezResist(Terrorized) 2.5%
- 24% (0.401 End/sec) Recovery
- 42% (1.783 HP/sec) Regeneration
- 4.725% Resistance(Fire)
- 4.725% Resistance(Cold)
- 2.5% Resistance(Negative)
- 8% RunSpeed
Code:
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WoW! This is great! Thank you so much, yes i guess i was going for +rech ^.^ the input on set bonuses was especially good. And I really appreciate the build you posted too.
Thanks again 
Let me first say I don't know the first thing about building Defenders.
But I wanted to give it a shot, seeing that debuffs are much appreciated in trials I wondered about making a Debuffer. I guessed that Dark/Ice would be nice because of, well, all their debuffs.
I made the following build as how I figured it should look. Again, I know very little about defenders. Have a look at what I came up with.
I know it won't be at all up to standard so some tips would be great, posting your own build would be even better. Thanks in advance.
Hero Plan by Mids' Hero Designer 1.90
http://www.cohplanner.com/
Click this DataLink to open the build!
Subzero Opression: Level 50 Natural Defender
Primary Power Set: Dark Miasma
Secondary Power Set: Ice Blast
Power Pool: Speed
Power Pool: Fighting
Power Pool: Leaping
Ancillary Pool: Dark Mastery
Hero Profile:
Level 1: Twilight Grasp -- Dct'dW-Rchg(A), Dct'dW-Heal(3), Dct'dW-Heal/EndRdx/Rchg(3), Dct'dW-Heal/Rchg(5), Dct'dW-Heal/EndRdx(5)
Level 1: Ice Bolt -- Dev'n-Hold%(A)
Level 2: Tar Patch -- P'ngTtl--Rchg%(A)
Level 4: Darkest Night -- DarkWD-ToHitDeb(A), DarkWD-Slow%(7), DarkWD-ToHitDeb/Rchg(7), DarkWD-ToHitDeb/EndRdx(9), DarkWD-ToHitdeb/Rchg/EndRdx(9)
Level 6: Howling Twilight -- Stpfy-Acc/Rchg(A), Stpfy-EndRdx/Stun(11), Stpfy-Acc/EndRdx(11), Stpfy-Stun/Rng(13), Stpfy-Acc/Stun/Rchg(13), Stpfy-KB%(15)
Level 8: Shadow Fall -- LkGmblr-Rchg+(A), LkGmblr-Def(15), LkGmblr-Def/EndRdx(17), LkGmblr-Def/EndRdx/Rchg(17)
Level 10: Frost Breath -- Posi-Dam%(A), Posi-Acc/Dmg/EndRdx(19), Posi-Dmg/Rchg(19), Posi-Acc/Dmg(21), Posi-Dmg/EndRdx(21)
Level 12: Fearsome Stare -- Abys-Dam%(A), Abys-Acc/Fear/Rchg(23), Abys-Acc/EndRdx(23), Abys-EndRdx/Fear(25), Abys-Acc/Rchg(25)
Level 14: Hasten -- RechRdx-I(A), RechRdx-I(27), RechRdx-I(27)
Level 16: Freeze Ray -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(29), Thundr-Dmg/Rchg(29), Thundr-Acc/Dmg/Rchg(31), Thundr-Acc/Dmg/EndRdx(31), Thundr-Dmg/EndRdx/Rchg(31)
Level 18: Petrifying Gaze -- G'Wdw-Dam%(A)
Level 20: Ice Storm -- P'ngTtl--Rchg%(A)
Level 22: Boxing -- Empty(A)
Level 24: Tough -- TtmC'tng-ResDam/EndRdx(A), TtmC'tng-ResDam/Rchg(33), TtmC'tng-EndRdx/Rchg(33), TtmC'tng-ResDam/EndRdx/Rchg(33), TtmC'tng-ResDam(34), TtmC'tng-EndRdx(34)
Level 26: Weave -- LkGmblr-Rchg+(A), LkGmblr-Def(34), LkGmblr-Def/EndRdx(36), LkGmblr-Def/EndRdx/Rchg(36)
Level 28: Bitter Ice Blast -- Thundr-Acc/Dmg(A), Thundr-Dmg/EndRdx(36), Thundr-Dmg/Rchg(37), Thundr-Acc/Dmg/Rchg(37), Thundr-Acc/Dmg/EndRdx(37), Thundr-Dmg/EndRdx/Rchg(39)
Level 30: Combat Jumping -- Ksmt-ToHit+(A), Krma-ResKB(39), GftotA-Run+(39), DefBuff-I(40)
Level 32: Dark Servant -- Dct'dW-Rchg(A), Dct'dW-Heal(40), Dct'dW-EndRdx/Rchg(40), Dct'dW-Heal/Rchg(42), Dct'dW-Heal/EndRdx/Rchg(42)
Level 35: Bitter Freeze Ray -- Hold-I(A), Hold-I(46), Hold-I(50)
Level 38: Blizzard -- Posi-Dam%(A), Posi-Acc/Dmg/EndRdx(42), Posi-Dmg/Rchg(43), Posi-Dmg/EndRdx(43), Posi-Acc/Dmg(43)
Level 41: Dark Consumption -- Efficacy-EndMod(A), Efficacy-EndMod/Rchg(45), Efficacy-EndMod/Acc/Rchg(45), Efficacy-Acc/Rchg(45), Efficacy-EndMod/Acc(46), Efficacy-EndMod/EndRdx(46)
Level 44: Dark Embrace -- S'fstPrt-ResKB(A)
Level 47: Soul Drain -- GSFC-ToHit(A), GSFC-ToHit/Rchg(48), GSFC-ToHit/Rchg/EndRdx(48), GSFC-Rchg/EndRdx(48), GSFC-ToHit/EndRdx(50), GSFC-Build%(50)
Level 49: Super Speed -- Run-I(A)
------------
Level 1: Brawl -- Empty(A)
Level 1: Sprint -- Empty(A)
Level 2: Rest -- Empty(A)
Level 1: Vigilance
Level 4: Ninja Run
Level 2: Swift -- Run-I(A)
Level 2: Hurdle -- Jump-I(A)
Level 2: Health -- RgnTis-Regen+(A)
Level 2: Stamina -- P'Shift-End%(A)